"The mind is its own place, and in itself can make a heaven of hell, a hell of heaven."

"The owl of Minerva spreads its wings only with the falling of the dusk."

"Scepticism is the freedom which thought achieves in itself."

"The world spirit is a spirit that does not suffer itself to be confined to one nation, but passes from nation to nation, from period to period."

"All that is real is rational; and all that is rational is real."